About SATC. SATC is a professional manufacturer of abrasive tools since 1990. Grit number is clearly printed on the disc—what you see is what you get. Higher numbers = finer grit. For best results: start with a low grit (e.g., 60–80) for rapid material removal, then finish with a high grit (e.g., 180–220) for a smooth, stain-ready surface.
eBay